1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef MINIKIN_FONT_FAMILY_H 18 #define MINIKIN_FONT_FAMILY_H 19 20 #include <vector> 21 #include <string> 22 #include <hb.h> 23 24 #include <utils/TypeHelpers.h> 25 26 #include <minikin/MinikinRefCounted.h> 27 #include <minikin/SparseBitSet.h> 28 29 namespace android { 30 31 class MinikinFont; 32 33 // FontStyle represents all style information needed to select an actual font 34 // from a collection. The implementation is packed into two 32-bit words 35 // so it can be efficiently copied, embedded in other objects, etc. 36 class FontStyle { 37 public: 38 FontStyle() : FontStyle(0 /* variant */, 4 /* weight */, false /* italic */) {} 39 FontStyle(int weight, bool italic) : FontStyle(0 /* variant */, weight, italic) {} 40 FontStyle(uint32_t langListId) 41 : FontStyle(langListId, 0 /* variant */, 4 /* weight */, false /* italic */) {} 42 43 FontStyle(int variant, int weight, bool italic); 44 FontStyle(uint32_t langListId, int variant, int weight, bool italic); 45 46 int getWeight() const { return bits & kWeightMask; } 47 bool getItalic() const { return (bits & kItalicMask) != 0; } 48 int getVariant() const { return (bits >> kVariantShift) & kVariantMask; } 49 uint32_t getLanguageListId() const { return mLanguageListId; } 50 51 bool operator==(const FontStyle other) const { 52 return bits == other.bits && mLanguageListId == other.mLanguageListId; 53 } 54 55 hash_t hash() const; 56 57 // Looks up a language list from an internal cache and returns its ID. 58 // If the passed language list is not in the cache, registers it and returns newly assigned ID. 59 static uint32_t registerLanguageList(const std::string& languages); 60 private: 61 static const uint32_t kWeightMask = (1 << 4) - 1; 62 static const uint32_t kItalicMask = 1 << 4; 63 static const int kVariantShift = 5; 64 static const uint32_t kVariantMask = (1 << 2) - 1; 65 66 static uint32_t pack(int variant, int weight, bool italic); 67 68 uint32_t bits; 69 uint32_t mLanguageListId; 70 }; 71 72 enum FontVariant { 73 VARIANT_DEFAULT = 0, 74 VARIANT_COMPACT = 1, 75 VARIANT_ELEGANT = 2, 76 }; 77 78 inline hash_t hash_type(const FontStyle &style) { 79 return style.hash(); 80 } 81 82 // attributes representing transforms (fake bold, fake italic) to match styles 83 class FontFakery { 84 public: 85 FontFakery() : mFakeBold(false), mFakeItalic(false) { } 86 FontFakery(bool fakeBold, bool fakeItalic) : mFakeBold(fakeBold), mFakeItalic(fakeItalic) { } 87 // TODO: want to support graded fake bolding 88 bool isFakeBold() { return mFakeBold; } 89 bool isFakeItalic() { return mFakeItalic; } 90 private: 91 bool mFakeBold; 92 bool mFakeItalic; 93 }; 94 95 struct FakedFont { 96 // ownership is the enclosing FontCollection 97 MinikinFont* font; 98 FontFakery fakery; 99 }; 100 101 class FontFamily : public MinikinRefCounted { 102 public: 103 FontFamily(); 104 105 FontFamily(int variant); 106 107 FontFamily(uint32_t langId, int variant) 108 : mLangId(langId), 109 mVariant(variant), 110 mHasVSTable(false), 111 mCoverageValid(false) { 112 } 113 114 ~FontFamily(); 115 116 // Add font to family, extracting style information from the font 117 bool addFont(MinikinFont* typeface); 118 119 void addFont(MinikinFont* typeface, FontStyle style); 120 FakedFont getClosestMatch(FontStyle style) const; 121 122 uint32_t langId() const { return mLangId; } 123 int variant() const { return mVariant; } 124 125 // API's for enumerating the fonts in a family. These don't guarantee any particular order 126 size_t getNumFonts() const; 127 MinikinFont* getFont(size_t index) const; 128 FontStyle getStyle(size_t index) const; 129 bool isColorEmojiFamily() const; 130 131 // Get Unicode coverage. Lifetime of returned bitset is same as receiver. May return nullptr on 132 // error. 133 const SparseBitSet* getCoverage(); 134 135 // Returns true if the font has a glyph for the code point and variation selector pair. 136 // Caller should acquire a lock before calling the method. 137 bool hasGlyph(uint32_t codepoint, uint32_t variationSelector); 138 139 // Returns true if this font family has a variaion sequence table (cmap format 14 subtable). 140 bool hasVSTable() const; 141 142 private: 143 void addFontLocked(MinikinFont* typeface, FontStyle style); 144 145 class Font { 146 public: 147 Font(MinikinFont* typeface, FontStyle style) : 148 typeface(typeface), style(style) { } 149 MinikinFont* typeface; 150 FontStyle style; 151 }; 152 uint32_t mLangId; 153 int mVariant; 154 std::vector<Font> mFonts; 155 156 SparseBitSet mCoverage; 157 bool mHasVSTable; 158 bool mCoverageValid; 159 }; 160 161 } // namespace android 162 163 #endif // MINIKIN_FONT_FAMILY_H 164
